I've had good luck with WhyDoWork Adsense. It's a free WP plugin.

i was looking for the same plugin thanks for asking the question....

Honestly, using a plugin to add an adsense block could cost you a lot of revenue. To help you understand what I mean, please check out the following link:

WordPress › Support » All in One Adsense and YPN Is NOT Free

I have personally used the plugin mentioned in the link on at least 70-80 blogs of mine, without ever knowing that my adsense codes were only being shown a small percentage of the time. I would have happily paid the developer for the plugin because it was so awesome, but instead, he snuck his publisher ID in place of mine, without ever letting me know he was doing this. Not cool at all...

If you decide to use a plugin, I highly recommend that you do your due diligence and be sure that your ads are being shown instead of the developer's ads at all times.

An alternative is to generate the code in your Adsense control panel, copy the code, and paste it in a text widget in your sidebar (or before the WordPress loop in your template files).

This might take a little extra work to integrate AdSense into your blog, but I'm paranoid about losing money that I earned fair & square, and I'm guessing you feel the same.

Now please... Don't think that all adsense plugin developers are using the same practice. Most of the developers out there are honest and up front with everything. I'm not telling you to completely rule out using a plugin to handle the hard work, but at least check around for some reviews or complaints about the plugin BEFORE using the plugin.

Hope that helps,

Jason

Okay Here's a Details Review on Several Adsense Plugins which myself investigating all the time for the better one, its upto you what to choose but be sure to make all the necessary checks when using one.

Advertising Manager
AdSense Attachment Page
AdSense Revenue Sharing
AdSense Under Image
WhyDoWork AdSense Plugin
WP Simple AdSense Insertion
Easy AdSense
AdSense Integrator
AdSense Now!
AdSense Immediately!
Adsense Deluxe
Adsense Injection
Adsense Beautifier
AdRotator WordPress Plugin
Adsense Earnings WordPress Plugin
AdSense Manager
AdSense Sharing Revenue and Earnings System –
Google Ad Wrap

Hope it Helps

Another option to keep in mind is to just edit your themes directly to include the Adsense (or other ad) blocks where you want them.

Plugins are nice, but for each new plugin you add, your WordPress site gets incrementally slower.

If you do some searches, you'll find tons of tutorials on how to do this - it's not that hard. Try this search:
how wordpress include adsense theme - Google Search

HTH!

Had success with WordPress › AdSense Integrator « WordPress Plugins

Quick AdSense lets you control where and how many ads show, and works for other ad blocks, too. It's free, as well.

Advertising manager is nice, except you can't exclude the adsense from certain pages.

Alternatively, if you're using the thesis theme, the thesis Open Hook Plugin will allow you to place your ads virtually anywhere on your page, but again, you can't exclude it from certain pages.

I use max banner ads. They have a free and paid version. Very easy to use with nice stats tracking built-into plugin.

Listed below are 10 best Adsense plugins which help you work smarter with wordpress.
Adsense Deluxe – offers advanced options for managing the automatic insertion of Google AdSense or Yahoo Publisher Network (YPN) ads to your WordPress posts. Easily switch all AdSense ads to a new color scheme across the entire site.
Adsense Injection – inserts Adsense code randomly into a pre-existing blog. Takes a random paragraph (or br tag) break in your article and inserts adsense code. It does one per story on multi-post pages (home, archive, category) and let’s you pick how many to show on single post pages.
Adsense Beautifier – makes your Adsense look beautiful by placing images beside them to increase your clicks (CTR) and subsequent Adsense earnings. (May not be compliant with Adsense TOS now)
AdRotator WordPress Plugin – rotates your adsense ads with other affiliate programs like Chitika Eminimalls wherever you want. Helps to reduce ad blindness and test different ad formats and affiliate programs.
Adsense Earnings WordPress Plugin – displays your adsense earning details within wordpress admin panel.
AdSense Manager – is a WordPress plugin for managing AdSense ads on your blog. It generates code automatically and allows positioning with Widgets.
AdSense Sharing Revenue and Earnings System – allows you to view your adsense earnings and share your adsense impressions with your friends and co-authors.
Google Ad Wrap – wraps posts and comments inside Section Targeting tags for better targeted ads.

adsense deluxe

I like Easy Adsense. It is simple to use, does good ad placements and you can have a number of ads set up and switch them out at will without having to put in the code over and over. I like it a lot.

My Favorite is Mighty Agsense but you can check out a very goo dlist at Pro-SEO: Top WordPress Plugins for Google Adsense

Reards,
daSSad

I honestly think that Quick Adsense is the best because it gives you the most flexibility in terms of where you place the ads within the content. It's good if you want to float them w/i a post, which I like...

Now Adsense doesn't support the WordPress and blogger blog.If you have old adsense account then you add your adsense in your blog otherwise its impossible.Now Google changed her adsense policy.

quick adsense is the best plugin for wordpress